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Title: Diurnal & Seasonal Trends in TEC Values Observed at Waltair
Authors: Rao, P V S Rama
Rao, M Srirama
Satyam, M
Issue Date: Sep-1977
Publisher: NISCAIR-CSIR, India
Abstract: The diurnal and seasonal trends in the total electron content, over Waltair ( 17.7oN; long. 83.3° E) are studied from the Faraday rotation on 40.01 MHz radio signals from INTASAT satellite. Since the satellite is sun-synchronized, observations have been obtained at roughly the same time each day, falling within the periods 0730-1015 and 1900-2145 hrs LT. It is observed that the TEC value NT is maximum during equinoxes and lower during solstices. The rates of change of electron content, dNT/dt are lower both in the morning and evening hours during solstices. It is found that TEC values are, in general, high around 0900 hrs as compared to 2100 hrs LT. The rate of increase of TEC around 0900 hrs LT is higher than the rate of decrease around 2100 hrs LT in all the seasons. During 0800-1015 hrs LT in the morning the amplitude of this anomaly increases with time, and during 1900-2145 hrs LT in evening the amplitude of the anomaly decreases with time. The diurnal development of the equatorial anomaly is well defined during the equinox months, Peak position of the anomaly shifts with time towards higher latitudes from 0800 to 1015 hrs LT and towards lower latitudes from 1900 to 2100 hrs LT in all the months. The shift in position of the anomaly peak is more consistent during morning hours and is found to be around 12° N at 0800 and around 16°N at 1000 hrs LT.
Page(s): 233-235
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.06(3) [September 1977]

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